Insulator



Dec. 25, 1923;

B. A. PLIMPTON INSULATOR Filed Nov. 8. 1920 INVENTOR fiezzilg 434/ ATTORNEY Patented Dec. 25, 1923.

UNITED STATES PATENT OFFICE.

BENTLEY A. PLIMP'ION, 0F LIMA, NEW YORK, A SSIGNOR 0F ONE-HALF TO THE PORCELAIN INSULATOR COMPANY, OF LIMA, NEW YORK, A CORPORATION OF NEW YORK.

IN SULATOR.

Application filed November 8, 1920. Serial No. 422,520.

T 0 all whom it may concern:

Be it known that I, BENTLEY A. PLIMP- TON, a citizen of the United States of America, residin at Lima, in the county of Livingston and State of New York, have invented certain new and useful Improvements in Insulators, of which the following is a specification.

My invention relates to the manufacture of sectional type insulators, wherein one section is arranged within another, as for instance in tin typeinsulators, and one of the purposes is to provide at minimum cost, a structure in which the several sections are held together rigidly so as to effectually re-' sist any strain or pressure that may ordinarily be imposed.

A further object of my invention is to construct the sections of the insulator in such manner as to simplify the assembling and manufacture of the unit and thus reduce the final cost.

The improvement is applicable more especially to insulators of the type embodying two or more sections each consisting of a hollow body portion closed at one end, a skirt portion and a base portion extending beneath the skirt portion, and in its brief aspect, the invention is made up of the following factors:

First, constructing the sections so that the outer surfaces of the end and sides of the body portion of an inner section engage and fit closely against the inner surfaces of the end and sides of the body portion of the adjacent outer section.

Second, forming the sections so that the bottom of the base portion of an outer section terminates somewhat above the top of the skirt portion of the adjacent inner section.

Third, formin a recess upon the inner surface of the si e of the outer section, adjacent to the base portion, so that the recess communicates with the space between the bottom of the base of the outer section and the top of the skirt of the adjacent inner section.

Fourth, placing the sections together in their final nested relationship with the end and side walls in close contact with one another.

out int The invention can, of course be applied to other forms of sectional insulators, and the disclosure of this application is intended merely to illustrate one of various practical forms. In the construction shown, there are three sections designated generally at A, B, and C, although the principles set forth are likewise applicable to insulators having only two, or more than three sections.

The sections are constructed with hollow body portions closed at one end as indicated at A, B, and C, and include skirt portions A B and C The body portions of the sections A and B terminate in base portions A and B the innermost section C being arranged for attachment directly to the sup.- porting pin, as well known in this class of insulators.

The sides and ends of the sections are formed so as to contact with and closely engage one another, and for this purpose, the connecting surfaces between the sides and ends are preferably curved as indicated by A and B, so as to'afford a continuous and unbroken contact between the adjacent surfaces of cooperating sections.

In order to secure the sections together, the base portions A and B are formed so as to terminate somewhat above the tops of the underlying skirt portions B and C thereby affording spaces a and b, and a and b designate recesses or pockets formed on the inner surfaces of the sides of sections A and B, at points adjacent to the base portions A and B The recesses a and 6 extend from the bottom of the base portions partially along the sides of the sections, but preferably only far enough to secure a proper union as best illustrated by the recess 6.

Otherwise constructed in the Thus the opposed horizontal surfaces of the sections and a substantial portion of the opposed side surfaces of the sections are in immediate contact with each other without the interposition of any cementing medium, and the contact between the opposed un cemented surfaces is sufficiently intimate to insure a firm connection between adjacent sections and to prevent any relative bodily movement of the sections, while at the same time the omission of the cementing medium from these opposed surfaces permits slight expansion and contraction without danger of breakage of the porcelain, and thus eliminates any disadvantages caused by slight unevenness of the contacting porcelain surfaces that is frequently characteristic of molded insulator sections. With this invention, the adjacent sections are held firmly at the point where the cementing medium is applied, and at other points of the opposed surfaces there is such contact as to insure proper relative positioning of the sections while theccmenting medium is applied, and to permit the necessary expansion and contraction of the sections without likelihood of breakage.

A suitable cementing medium is poured or otherwise placed in the recesses a and Z), and the walls of the recesses are preferably grooved as indicated by a and 6 or otherwise roughened, to cause the cementingmedium to adhere more firmly. If desirable, the recesses for the cementing medium may be provided upon the opposite sections from those shown or upon both adjacent sections, and it will be understood that the adjacent surfaces of the sides and ends of the sections are in close contact with each other at all points except where recessed for the cementing medium, at least one of the surfaces being recessed for this purpose.

From this, it is apparent that the contour and fit of the contacting surfaces of the sections would, of themselves, prevent any relative lateral or rocking motions, and the function of the cementing medium is to pre vent longitudinal relative movement of the sections, or separation along a longitur linal axis, and thus retain the sections firmly united into a strong rigid unit.

The sections having been moulded or form shown, they are first nested together in their final positions, after which the cementing medium is poured through the spaces aand 6 into the recesses a and b, or otherwise placed in said recesses and permitted to harden. 7

Although the invention is illustrated and described with reference to a particular embodiment, it is not limited to the precise form set forth, and this application is intended to cover any other adaptation or ac/sew modifications, coming within the scope of the improvement and of the claims hereinafter.

I claim:

1. An insulator :omprising a plurality of nested hollow sections having closed ends, the outer surfaces of the sides and end of the inner section fitting closely against and contacting with the inner surfaces of the sides and end of the outer section, one

f the sections having a recessformed in its side opposite the adjacent surface of the cooperating section, and a cementing medium in said recess.

,2. An insulator comprising a plurality of nested hollow sections having closed ends, the outer surfaces of the sides and end of. the inner section fitting closely against and contacting with the inn r surfaces of the sides and end ofthe outer sec tion, base and skirt portions formed on the sections, the lower end of the base portion of the outer section being spaced above the top of the skirt portion of the inner section, the outer section having a recess formed in its side and extending from the bottom of its base portion upwardly, and a cement-medium in said recess.

3. An insulator comprising a plurality of nested hollow sections having closed ends, the outer surfaces of the sides and end of the inner section fitting closely against and contacting withthe inner surfaces of the sides and end of the outer section, base and skirt portions formed on the sections, the lower end of the base portion of the outer section being spaced above the top of the skirt portion of the inner section, one of the sections having a recess formed in its sides adjacent to the bottom of said base portion, and a'cementing medium in said recess.

a. An insulator comprising a plurality of nested hollowsections having closed ends, the outer surfaces of the sides and end of the inner section fitting closely against and contacting with the inner surfaces of the sides and end of the outer section, base and skirt portions formed-on the sections, one of the sections having a recess adjacent to said base portion to receive a cementing medium the bottom ofthe base portion of the outer section being spaced above the skirt of the inner section to afford access to said recess, and a cementing medium in said recess.

5. An insulator comprising a plurality of nested hollow sections having closed ends, the adjacent surfaces of'said sections having contact and acting to position said sections both vertically and. horizontally, and a cementing, medium applied betweenportions of the sidewalls of said sections, the remaining portions of said side walls and the contacting end walls being uncemented and free to expand or contract.

6. An insulator comprising a plurality of nested hollow sections, means acting automatically to position said sections both vertically and horizontally, one of the sections having a cement receiving recess in its side Wall, the end walls and portions of the side walls of said sections being 'unoemented and free for expansion or contrac- 10 tion.

In witness whereof, I have hereunto signed my name.

BENTLEY A. PLIMPTON. 

